Can You Count?

How many "F's" are in the below quote....
count em'!

FINISHED FILES ARE THE RE
SULT OF YEARS OF SCIENTI
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS...

3?

Are you sure?

Count them again....


Now scroll down.

Nope! there are 6.... for some reason,
the f's in "of" are invisible, right?